Surface Preparation第 11 / 100 题
Bare ferrous (iron/steel) metal should be primed with what type of primer to prevent corrosion?
a.A drywall sealer
b.A masonry block filler
c.A rust-inhibitive metal primer
d.A latex wood primer only
解析
Ferrous metals rust when exposed to moisture and oxygen, so a rust-inhibitive (corrosion-resistant) primer is used to protect the steel and provide adhesion for the topcoat. Block fillers and drywall sealers are formulated for masonry and gypsum, not metal. Surface rust should be removed before priming.
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